groff "mom": How to add vertical space around bullet items?

[Steve Ross]

All,
I may have missed it in the "mom" documentation, but I'm looking for a way to 
adjust the vertical spacing between the ITEMs of a LIST.
So, as an example output for a list with two list items:
   o This is the first item of the list.     This item wraps and spans two 
lines.                                             ^
                                             |  How can I control               
                              |  this spacing 
                                             |  between list items?
                                             v
   o This is the second item of the list.     This item also also wraps and 
spans 
     three lines.
The PARA_SPACING macro affects the spacing of a list item only if that item 
includes subsequent paragraphs started with the PP macro.
The LISTS_STYLE macro applies (I think) only to LIST_OF_EQUATIONS, 
LIST_OF_FIGURES, and LIST_OF_TABLES.  It doesn't affect my LIST.

Thanks in advance for any insight that you can offer,-- Steve Ross